Characterisation of blade tip vortices by simultaneous
time-resolved velocity and density field measurements

Lang, Waldemar and Mulleners, Karen and Hernandez-Rivera, Ricardo and Schairer, Edward T. and Heineck, James T. and Raffel, Markus
(2012)
Characterisation of blade tip vortices by simultaneous
time-resolved velocity and density field measurements.
International Workshop on the Application of Praticle Image Velocimetry for Aeroacoustics and Noise, 16. - 17. Apr. 2012, Delft, The Netherlands.

Full text not available from this repository.

Abstract

The flow field around a helicopter is dominated by strong coherent vortices originating from
the blade tip as a result of the pressure difference between suction and pressure side and a high
radial velocity at the tip (Leishman, 2001; Green and Acosta, 1991). These vortices have a strong
impact on the rotorcraft acoustics and performance due to its interactions with the rotor blades
and the helicopter fuselage (Conlisk, 2001). Detailed knowledge of the vortex development, in
particular of the formation process, and the scaling of characteristic parameters, e.g. vortex size
and strength, are necessary for the design and the optimisation of vortex control measures. Due
to the complexity and the inherent unsteady character of the vortex dynamics, this can only be
achieved by time-resolved measurements of the velocity and density field simultaneously.

Document Type:

Conference or Workshop Item (Speech, Paper)

Additional Information:

Vortrag wurde von Prof. Markus Raffel gehalten

Title:

Characterisation of blade tip vortices by simultaneous
time-resolved velocity and density field measurements